問題一覧
1
Chemical oxidation is the
direct combination of a metal with the oxygen in the atmosphere .
2
Oxidation rate of a metal usually
increase with an increase in temperature.
3
In the galvanic action process
the anode always corrodes
4
In the process of crevice corrosion, the anodic are is at
the bottom of the crevice
5
When a metal is in contact with a fluid which promotes the growth of microbiological contaminants , such as in kerosene fuel and toilet waste fluids,
microbiological corrosion is a present danger.
6
Intergranular corrosion is caused by
incorrect heat treatment.
7
Magnesium alloys
are not susceptible to intergranular corrosion.
8
is a microbial fungal growth in kerosene fuel.
Hormocoins resinae
9
Intergranular corrosion
often cannot be detected and has no visual surface indication.
10
can be recognized on aluminum alloys by the appearance of grayish powder fuzzy deposit or a whiskey growth
Mercury contamination
11
The oxide film formed on the surface of aluminium is
non-porous .
12
Corrosion will spread more rapidly when metals are exposed to
high temperatures.
13
Corrosion at the grain boundaries is called
intergranular
14
attack along the grain boundaries, or immediately adjacent to grain boundaries,
Intergranular corrosion
15
Intergranuler corrosion can be confirmed by
X-ray inspection.
16
Stress corrosion is
corrosion due to fretting.
17
is the tendency of metals to revert to the thermodynamically more stable, oxidized, state
Corrosion
18
is another name for electrolytic, electro‑chemical or dissimilar metal corrosion.
Galvanic corrosion
19
is a form of extremely localized corrosion that leads to the creation of small holes in the metal may be caused by localized damage to protective coating.
Pitting corrosion
20
Corrosion caused by galvanic action is the result of
contact between two dissimilar metals.
21
Microbiological corrosion refers to corrosion and ensuing loss of metal caused by
biological organisms.
22
is NOT one of the conditions for corrosion to occur.
The presence of a cladding film
23
The appearance of corrosion on Steel is normally as
reddish brown (rust).
24
The appearance of corrosion on Aluminium alloy is normally as
whitish powder.
25
is not one of the listed condition for corrosion to be occurred.
torque load
26
Corrosion may be recognised by the appearance of ‛cocoa’ powder staining on steels is called
Fretting corrosion.